Bosch Tankless Heating Units
Bosch 225,000 BTU Commercial Tankless Water Heater - Liquid Propane
Bosch 225,000 BTU Commercial Tankless Water Heater - Natural Gas
How to Select
How to Select a Tankless Water Heater
The most important factor when deciding which tankless water heater to purchase is based on the number of fixtures you need to get heated water to and the amount of water to heat. It is not uncommon for a homeowner to purchase the tankless unit that seems correct for their application to find that they miscalculated. We always recommend purchasing a tankless unit with redundancy in output; therefore you will never have an issue with lack of hot water. Most ratings from the manufacturer do not take into account your unique plumbing situation, so consulting a professional is recommended.
Before you pick out your tankless heating unit, you will want to check the following:
- Power Type: Electrical, Natural Gas, Liquid Propane. Depending on your house utility configuration, you can connect a tankless unit to any of the following power sources, however, you must consider that an electrical tankless unit will not work in Natural gas applications or Propane, and vice versa.
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For Electric Tankless Heating Units, your amperage and voltage are very important. Your breaker size may be too small, or may need to be upgraded to accommodate the new heater. If this is the case, upgrade to a breaker that will have some redundancy in power rating.
(For example, if your tankless heating unit requires a 40 Amp breaker, we recommend installing a 50 Amp just in case.) - How far your tankless heating unit will be installed from your fixtures. If your heater is too far from your shower, or faucets, they will either get a reduced flow of water, or a lack of heat. This is caused by the added traveling distance the water must travel through your pipes. If this is a concern for you, consult our staff for expert advice, or consult the installer for recommendations.
- Whole house or Point of Use. Point of use tankless units only operates with a single fixture at the point of use. Some point of use models can work with extension kits to expand usage to multiple fixtures. Whereas whole house tankless units are designed for larger volumes and will provide heated water to all fixtures in your household. Once again, it is important to take redundancy into account with Whole house heaters to make sure each fixture has steady, warm flow.
For additional assistance, or for expert advice, contact our Customer Service Department through Live Chat or by calling 1-877-998-9378.
How to Install
How to Install Tankless Water Heaters:
It is recommended that you have a licensed plumber install your tankless water heater. With certain models that require electricity you may also need to consult an electrician. You must be sure to turn off all gas going to the gas lines that you will be using.
What you will need?
Tools:
- Reciprocating Saw
- Emery Cloth
- Torch
Materials:
- Tankless Water Heater
- 2x4 Boards
- Joist Lumber
- Vent Piping
- Thimbles
- Backboard
- 3/4" Copper Water Piping
- Soldering Flux
- T-Valve
- Stainless Steel Gas Line with Shut-Off Valve
When installing a new tankless water heater you can install it in the same area as your old tanked water heater to cut down the amount of work needed to install it such as extending gas lines, extending water pipes and installing a new vent pipe. There must be a vent pipe that runs from the tankless water heater to an location outside and must be installed downward to prevent rainwater and other elements from entering the vent pipe. Depending on the tankless water heater you are installing the size of the venting pipe needed may vary (check the specifications for the model you are installing to see what size you need). If installing in new construction select a wall towards the exterior of the house to install the vent pipe. Certain models may require a fresh air intake as well. With models such as these you will need additional thimbles and thimble holes.
When installing a new vent pipe measure and properly mark the interior and exterior walls for thimble holes. Test the thimble but do not install it yet. The timble will be installed after the vents have been installed and the angles have been checked. Once you have installed the thimbles slide the vent pipe into the thimble and secure it. Be sure to check the directions of you tankless water heater for national and local code requirements.
After the vent piping is installed it is time to mount your tankless water heater. Be sure where you are mounting the tankless water heater lines up your vent pipes. If you are mounting your tankless water heater to a concrete or brick wall you will need to attach your 2x4s to a joist to be able to attach your backboard. Measure your backboard to the exact dimensions and attach your 2x4s. The last step in mounting your tankless water heater is to liine it up with your vent pipes and just screw it into place.
Now you are ready to run your new water pipes to your tankless water heater. When you are working with new copper water pipes the ends need to be cleaned with an emery cloth. Once the ends have been cleaned it is time to apply your soldering flux to the ends of the pipes. Once the soldering flux has been applied slide the pipes into the fitting, once together apply the inner flame of the heating torch to the fitting for approximately 10 seconds. Once the metal is hot enough touch the solder to the joint and work your way around the fitting on both sides until the joint fits properly. Installing a separate isolation valve kit makes maintenance easier and a relief valve will prevent pressure from building up. For gas tankless water heaters you must install a T valve to the existing gas line. Once the T valve has ben installed a corrugated stainless steel gas line needs to be run from the T valve to the tankless water heater. A gas shut off valve must also be installed to the line before you connect it to the sediment trap of the tankless water heater (the short pipe that runs downward from the bottom of the water heater). Once everything has been attached use a sensative gas sniffer to detect if you have a gas leaks.
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